Laboratory tests on geosynthetic-encapsulated sand columns

Wu, Chien-Sheng; Hong, Yung-Shan

doi:10.1016/j.geotexmem.2008.09.003

Cited by 111 publications

(24 citation statements)

References 22 publications

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“…In very soft clays where granular piles do not achieve significant load capacity due to poor lateral confinement, geosynthetic encased granular piles are used to increase stiffness and reduce bulging by mobilisation of hoop stress in reinforced material [8][9][10]. In the past, laboratory model tests have been conducted on geotextile as well as geogrid vertical encased end bearing granular piles [10][11][12][13][14][15][16]. The reinforcement in the form of horizontal strips, placed at regular spacing in granular piles enhance the load carrying capacity and control bulging by mobilising frictional resistance between strips and stone aggregates [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Hasan

Samadhiya

2016

Int. J. of Geosynth. and Ground Eng.

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The installation of reinforced granular piles is a commonly adopted technique to improve load carrying capacity and reduce settlements in very soft clayey soils. This paper presents results of a series of laboratory model tests and numerical analysis carried on geosynthetic reinforced granular pile under short term loading. Unit cell concept has been adopted. Laboratory model tests were conducted on unreinforced, vertical encased, reinforced with horizontal strips and combined vertical-horizontal reinforced granular piles. The loading was applied either over the entire cylindrical tank area or only over the area of granular piles. The effects of various parameters such as reinforcement, encasement stiffness, shear strength of clay, length and diameter of granular piles have been studied. Experimental results in the form of vertical load intensitysettlement relationship have been compared with that obtained from PLAXIS 3D. The results of laboratory model tests indicated significant influence of reinforcement on the ultimate load intensity of granular piles and ultimate bearing capacity of treated ground. Lateral bulging in reinforced granular piles has also been controlled by incorporating geosynthetic materials.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Hasan

Samadhiya

2016

Int. J. of Geosynth. and Ground Eng.

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“…In recent years, use of encased columns as a ground improvement method is increasing. Granular inclusions are encapsulated in geosynthetic materials to increase the resistance to bulging [37][38][39][40][41][42] . The pioneering work on gravel drains as a possible method to stabilize liquefaction susceptible soil deposit is reported by Seed and Booker [4] .…”

Section: Methodsmentioning

confidence: 99%

Engineering of Ground for Liquefaction Mitigation Using Granular Columnar Inclusions: Recent Developments

Krishna¹,

Madhav²

2009

American J. of Engineering and Applied Sciences

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Problem statement: Liquefaction was the most hazardous damage during an earthquake. Ground improvement techniques were employed to mitigate liquefaction hazards. Most common methods to improve engineering properties of soils are densification, reinforcement, grouting/mixing and drainage. Among various remedial measures available, installation of columnar granular inclusions is the most widely adopted method for liquefaction mitigation. Approach: Columnar granular inclusions function as drains and permit rapid dissipation of earthquake induced pore pressures by virtue of their high permeability. Results: One of the chief benefits of ground treatment with granular piles is the densification of in situ ground by which the in-situ properties of the ground get modified to mitigate liquefaction potential. Further, the very high deformation modulus and stiffness of the granular pile material provide reinforcement for the in situ soil and offer another mechanism to mitigate liquefaction. The study described briefly the phenomenon of liquefaction and the associated features. A short discussion on various ground improvement methods available for liquefaction mitigation was presented highlighting the importance of columnar inclusions. Construction methods of different granular columnar inclusions like sand compaction piles/ granular piles were discussed briefly. Recent developments in the research of columnar granular inclusions as liquefaction counter measures were presented in relation to physical, numerical and analytical model studies. Conclusion/Recommendations: Columnar granular inclusions were demonstrated to be very effective for liquefaction mitigation in different case studies and research investigations.

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“…Laboratory model tests on geosynthetic-encapsulated stone columns have been performed by AYADAT and HANNA [7], DI PRISCO [8], MALARVIZHI and ILLAM-PARUTHI [9], MURUGESAN and RAJAGOPAL [10], GNIEL and BOUAZZA [11], WU and HONG [12], etc.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Experimental Analysis on Encapsulated Stone Column

Tandel

Solanki

Desai

2013

Archives of Civil Engineering

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The application of stone column technique for improvement of soft soils has attracted a considerable attention during the last decade. However, in a very soft soil, the stone columns undergo excessive bulging, because of very low lateral confi nement pressure provided by the surrounding soil. The performance of stone column can be improved by the encapsulation of stone column by geosynthetic, which acts to provide additional confi nement to columns, preventing excessive bulging and column failure. In the present study, a detailed experimental study on behavior of single column is carried out by varying parameters like diameter of the stone column, length of stone column, length of geosynthetic encapsulation and stiffness of encapsulation material. In addition, fi nite-element analyses have been performed to access the radial deformation of stone column. The results indicate a remarkable increase in load carrying capacity due to encapsulation. The load carrying capacity of column depends very much upon the diameter of the stone column and stiffness of encapsulation material. The results show that partial encapsulation over top half of the column and fully encapsulated fl oating column of half the length of clay bed thickness give lower load carrying capacity than fully encapsulated end bearing column. In addition, radial deformation of stone column decreases with increasing stiffness of encapsulation material.

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Laboratory tests on geosynthetic-encapsulated sand columns

Cited by 111 publications

References 22 publications

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Engineering of Ground for Liquefaction Mitigation Using Granular Columnar Inclusions: Recent Developments

Laboratory Experimental Analysis on Encapsulated Stone Column

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